Added message to exit method

Author: willmcgugan

src/textual/_compositor.py

@@ -449,7 +449,7 @@ def add_widget(
                     map[widget] = MapGeometry(
                         region + layout_offset,
                         order,
-                        clip,
+                        clip if widget.is_container else sub_clip,
                         total_region.size,
                         container_size,
                         virtual_region,

src/textual/app.py

@@ -414,14 +414,19 @@ def screen_stack(self) -> list[Screen]:
         """list[Screen]: A *copy* of the screen stack."""
         return self._screen_stack.copy()
 
-    def exit(self, result: ReturnType | None = None) -> None:
+    def exit(
+        self, result: ReturnType | None = None, message: RenderableType | None = None
+    ) -> None:
         """Exit the app, and return the supplied result.
 
         Args:
             result (ReturnType | None, optional): Return value. Defaults to None.
+            message (RenderableType | None): Optional message to display on exit.
         """
         self._return_value = result
         self.post_message_no_wait(messages.ExitApp(sender=self))
+        if message:
+            self._exit_renderables.append(message)
 
     @property
     def focused(self) -> Widget | None:

src/textual/widgets/_tree.py

@@ -451,6 +451,7 @@ def get_label_width(self, node: TreeNode[TreeDataType]) -> int:
 
     def clear(self) -> None:
         """Clear all nodes under root."""
+        self._line_cache.clear()
         self._tree_lines_cached = None
         self._current_id = 0
         root_label = self.root._label
@@ -810,7 +811,7 @@ async def _on_click(self, event: events.Click) -> None:
             cursor_line = meta["line"]
             if meta.get("toggle", False):
                 node = self.get_node_at_line(cursor_line)
-                if node is not None and self.auto_expand:
+                if node is not None:
                     self._toggle_node(node)
 
             else: